DE2327046A1 - FATHER PIECE OF THE VELVET FASTENING - Google Patents

Description

COHAUSZ & FLORACK

PATBNTANWAITSBÜHO O "3 O 7 Π / C

4 PÜSSHL, DOHF SOHUMANNSTR. 97 <£ y & ■ I U H D

PATENTANWÄLTE] Dipl.-Ing. W. COHAUSZ ■ Dipi.-Ing. W. FLORACK Dipl.-Ing. R. KNAUF · Dr.-Ing., Dipl.-Wirtidi.-lng. A. GERBER

Kanebo Ltd.

5-26, Tsutsumidori J-chome

Suiaida-ku, Tokyo, Japan ■ 25th Kai 1975

Father part of the suction attachment .

Me invention relates to a veater piece of velvet fastening, in particular an improvement on the tater element that comes with a side enlarged cap is provided, which is formed on an upper end portion of a shaft, which is of a base fabric of the father piece stands upright. . -

It is known that there are two different types of velvet fastenings gives. One daevon is the attachment that is described in the TJS patent 3 009 2j55 is known, the other is the attachment that is known from US patent specification 5,607,995. With the former Attachment, the male piece is provided with a "multitude of hook elements for engaging in loop elements of the mother piece, while in the latter attachment, a male element is capped at the upper end portion of a shaft that instead of the hook element is used. The latter type of father element has been found to have a superior intervening function with a loop of a nut member when a shear force is exerted between the male piece and the mother piece, compared to the former father bw. Hook element. What the material for making the male element of the latter type of fastening, polyolefin or polyamide monofilament yarn is preferably used, and because of the advantageous properties of elasticity and thermal endurance and the strength, etc. Furthermore, it has been established from practice that the strength of the connected part is between the cap and the stem of the male element are insufficient, and consequently the cap tends to separate from the adhesive when fastening is used repeatedly.

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The invention is essentially based on the following: The above disadvantages of the kaintbefestigung the last: = u λν. &; - ::;: i; * g to "eliminate".

The invention is described below with reference to the drawings η al. :: _äutert " In the drawings there are

Fig. 1 is a diagram of an embodiment; . · .Tuoxs according to the invention,

Pig. 2A to 2D enlarged side views of the perpetrators. "^ speaking of the manufacturing steps of the Saintbefes. ^ '^:; \; /] ^ in the last version,

Ji ¹ Ig. 3 an enlarged longitudinal section through a vate: g§. ^; jr-r conventional attachment of the latter embodiment ..:.: .., .uir-: purposes of comparison with the invention and

Pig. 4 an enlarged longitudinal section through a Taterelt: t:. ^ s in Fig. 1 is shown.

First of all, the method for producing the father's piece of a velvet fastening of the latter version is analyzed. According to "rig. 1 and 2A to 2D wind according to the description of US Patent No. 3,607,995, the male piece that the following steps are performed: (1) A double-woven fabric, wherein the two base cloths 2 by connecting yarns 1 from daducch hergestel It, (2) The base cloths 2 are separated from each other by cutting the connecting threads 1 so that each separated base cloth 2 is provided with a plurality of upright single thread pieces 1 '. (3) The separated base cloth 2 becomes coated with a binding resin so that the upright piece of thread 1 'is bound therewith, consequently material cloth is made. (4) Then the material cloth is passed through a water bath to cool the material, and immediately, the material becomes a Heat treatment process supplied , in which the tip of each upright _{stick of thread is melted;} inuu-a heat energy quickly ang is laid while the lead, "bop. do> art ie

309860/0942 ORIGINARY BATHROOM,

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the same is kept in crystalline composition. (5) After this heat treatment, the material is passed through cooling water, to allow the melted portions of the material to solidify bring.

! According to the heat treatment mentioned above, a A large number of tater elements consisting of a shaft part and a melted b'pitzenpartie 4-b of the same exist, on the base cloth 2 be shaped so that the male piece shown in Fig. 5 is formed. In the above manufacturing method, a pile knitted ! Cloth can be used instead of the pile-woven cloth.

When the synthetic resin material is melted in a crystalline composition, this melted portion Qb has an amorphous composition. The molten part of the upright monofilament yarn of the parent piece thus has an amorphous composition. With the melting of the tip part, this part has a mushroom shape that is expanded laterally. The portion is hereinafter referred to as a cap 4 ^ and the remaining upright portion of the thread is hereinafter referred to as a shaft 4b. As already shown, the cap 4b has an amorphous composition, while the shaft 4a has a crystalline composition. There is no critical boundary between these amorphous compositions and the crystalline compositions. In the connection or boundary area between the shaft and the cap, however, the composition of the polyamide polymer changes markedly from the crystalline state to the amorphous state. This connection part is therefore one of the weak points of the father element. In order to confirm the above-mentioned weakness of the delimitation part between the cap 4 and the shaft 4a of the male element, a microscopic examination of this part was carried out. It has been found that a certain number of male elements are provided with hoists which are present in the cornice of the same. These cracks 5 are likely to arise according to the difference in heat shrinkage between the cap and the upper part of the shaft, the effect of rapid heating

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and quick cooling. So if a strong eye is between a seized father piece and mother piece is exercised, - will ■ the aforementioned cracks expand, and eventually become in a certain number of male elements the cap 4b of the respective one Shank 4a of the same separated.

There are both theoretical and experimental views and considerations has been employed to eliminate the aforementioned weak point in the transition area of each male element. as As a result of these considerations, the following solution has arisen. at According to the present invention, a polyamide polymer monofilament yarn is used as a material for the pile yarn used with a core part 6a and a shell part 6, which covers the core part (Fig. 4). Important is while the core part 6a is made of a polyamide polymer with a lower melting point, while the shell part 6 is made of Another polyamide polymer is made, which has a higher melting · ^ point than the core part. So if the: -Above mentioned heat treatment takes place and the tip of the shaft is melted, the tip of the core part 6a and the tip of the sheath part 6 are melted, as shown in FIG. Since the melting point of the polyamide polymer the core part 6a is lower than that of the cladding part 6, the cap consists of a melted core part 6b and the outer one Layer 6c and an intermediate molten part 6d, the is formed between the core part 6b and the outer layer 6e. As a result of the microscopic examinations, it would be confirmed that the Core part 6b and the outer layer 6c with a molten polyamide polymer Core part 6 of the SC adhesive were formed, while the intermediate part 6d of a molten polyamide polymer from the Shell part 6 is formed. Even if certain cracks 8 arise in the transition area, the cracks 8 at the inner end cannot continue to run because the outer layer 6c is present, so that the above disadvantage can be prevented. The experimental test that will be explained below proves this characteristic feature.

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As for the polyamide polymer used to make the polyamide polymer monofilament yarn for making the male element according to the invention, it is preferred to use polycapramide, which is formed by the polycondensation of epsilon- 'caprolactum or β-aminocaproic acid or a mixture thereof, polyhexamethylene adipamide and polymers, consisting of polycapramide or polyhexamethylene adipamide as main components and having substantially the same properties as those of polycapramide or polyhexamethylene adipamide, and there may be one or more other components copolymerized with the above polymer-forming monomer. These polymers may include inorganic or organic materials, if desired, such as matting agents, dyes, weatherproofing agents (ultraviolet ray absorbing agents), antistatic agents, plasticizers, and flame retardants. Polyamide polymer monofilament yarn uses two of these polymers with different melting points "used and spun together in a sheath-core-shaped yarn. In order to obtain a yarn which is suitable for the purpose of the invention, the difference should in the melting points of the polymers constituting the mantelkerförmige yarn be more than 2o ° C, preferably 4o to 60 ⁰ C. When the difference in melting point less than 20 ° C, it is difficult to cover the subsequently melted part with the first melted part at the time of the heat treatment. On the other hand, if the difference in the melting points is more than 60 ^° C., the cap cannot be formed normally in most cases due to the fact that the amount of molten polymer in the first molten part is too large for the Amount of molten polymer in the subsequently molten part.

For the two component polymers of the polyamide polymer monofilament yarn According to the invention, homopolymers can be used in combination with one another be used. However, it is appropriate that a known

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copolymerized polyamide polymer is used as one of the two-component polymers, together with the above-mentioned homopolymer, or that polymers with the melting point difference from 2o to 6o ° C can be chosen from the different types of copolymerized polyamides. and as the two-component polymers be used. In general, it is expedient to use polyamides with a low melting point from a two-component system and a three-component system. These Two-component pol-ymers can form the desired cap is sufficient for practical use if the difference in melting points is less than 60 ° C.

For practical use of the velvet fastening according to the invention a monofilament yarn with a thickness in the range from 7o denier to 1,000 denier is used, preferably 2oo denier to 800 denier. The single filament drawn yarn having a crystalline composition must be used. However, the thicker single thread can be used depending on the end use of the fastener when weaving or knitting can be performed. With regard to the Cross-sectional shape of the single filament yarn is preferably a yarn with a round cross-section is used, - in which the core part and the shell part have a concentric longitudinal axis.

The intake ratio (in weight) between the core portion and the sheath section in the single thread yarn can be selected in a range between 8o / 2o to 50/50.

example

A single filament yarn of 300 denier was made by in the jacket section polyamide polymer 6 with a 'melting point of 215 ° C was used, the preparation by polymerization

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of epsilon-caprolactam was carried out, while in the core part copolymerized polyamide was used, which had a melting point of 170 ° C. and consisted of 52 parts of polyamide polymer 6 and 48 parts of polyamide polymer 66. Melt spinning was carried out at ^λ 280 ° C. through a spray nozzle in order to spin sheath core-like yarn together, and the intake ratio between the sheath section and the core section in the resulting yarn was 25:75 3 by weight. The yarn was then drawn in a conventional manner.

The above-mentioned single filament yarn was used as a material used for the pile. A pile cloth was made under the following Conditions established:

(a) Structure of a basic cloth 2/1 rib weave

(b) chain yarn polyamide polymer single thread loo d / 24 f Weft polyamide polymer single thread loo d / 24 f

(c) Density of chain yarn 2o / inch
Weft 25 / inch

(d) pile yarn 300d polyamide polymer single thread Density 15 / in

(e) One pile became every eight. Recordings in an arrangement easier Weaving formed

(f) Height of the pile 2 mm

The above pile cloth was subjected to a heat treatment process forwarded. In this procedure the tip of the upright shafts of the single thread was exposed to a heater, which was held at 35o ° C for a period of 1 / lo second by moving the material at one speed of 3 m / min, so that the tip of each upright shaft of the single filament yarn was melted. The father element was then created.

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For the purpose of a comparative test, two conventional fasteners made by using a polyamide polymer monofilament yarn and a polypropylene monofilament yarn, namely using an equivalent treatment process, except that a different heat treatment temperature was used (55o ° C for the polyamide polymer thread, 32o for the polypropylene thread). These father elements had the structure shown in FIG. Repeated tests were then made of the number of times the connection and disconnection were performed until at least loosened a cap. Furthermore, the resistances to loosening were measured using the following tests. After a firm engagement of the male piece in the mother piece, one end "of the male piece was pulled upward away from the mother piece, and the force that had to be used to separate this end of the father piece from the mother piece was measured by a spring balance measured. This resistance is shown as a separation resistance (g / om) in the table. The shear resistance was measure by using the following measuring method. After a firm engagement of the mother piece and the father piece a free end of the male piece and a free end of the mother piece were established with the aid of two gripping devices of a tension measuring device seized. In this part the width of the test pieces was 2 cm, the distance between the two gripper devices was Io cm, the length of the attack area was 2 cm. The force that had to be used to get the father piece from Separating the nut piece was made using this tensile testing device measured. A shear force in kg / cm was then obtained from the force measured above. The above tests were also performed after the father piece and the mother piece 3,000 times had been seized and separated.

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Eifd

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Material of the monofilament yarn for a pile yarn Test Polypropylene Polyamide ^{polymer 1} Invention (Ex.)

Number of test repetitions

until torn off at least 37o ■ 52o 12Jo

a cap. '■.

Initial state, ^y '

Peel test g / cm 98.2 112.5, Io3.5

Shear force kg / cm ² 5.1 5.2 3.1

After attacking 300 times
and loosening -

■ Stripping test g / cm · 72.1 86.5 · 99.3 Resistance kg / cm ² 2.3 2.1 3, ο

The father piece according to the invention thus has a superior quality in the Compared to the conventional male piece, as the table shows.

Expectations;

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Claims (4)

7327046 - ίο - claims 1. Father piece of a velvet fastening with a multitude of father elements that upright from a basic cloth protrude, characterized in that each male element is made of a synthetic monofilament yarn made from a core part along an axis thereof and consists of a shell part surrounding the core part, wherein the core part consists of a first polyamide polymer with a lower melting point, while the sheath part made of a second polyamide polymer having a higher melting point compared to the first polyamide polymer-polyamide resin ", wherein the male element consists of a shaft and a laterally enlarged cap, which at an upper end part of the shaft and consists of a core and an outer layer made of the first polyamide polymer consists, further from an intermediate part, which consists of the second polyamide polymer. 2. father piece according to claim 1, characterized in that the temperature difference in the melting points of the first and the second polyamide polymer is more than 2o C and is preferably in a range between 4o ° C and 6o ° C. j5. Father piece according to claim 1, characterized in that a Content ratio of the first polyamide polymer to the second polyamide polymer by weight in a range is between 2o / 8o and 5o / 5o. 4. father piece according to claim 1, characterized in that a Cross-section of the shaft is provided with a round shape, which consists of a round core part and an annular jacket part is formed, which coaxially encloses the core part, 09850/0942 Blank page